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| author | Nathan Lynch <nathanl@linux.ibm.com> | 2024-05-30 19:44:12 -0500 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2024-06-28 22:28:58 +1000 |
| commit | 0974d03eb479384466d828d65637814bee6b26d7 (patch) | |
| tree | 9e61fa2740cb95cd3bb6a215534c526c025724a2 /rust/helpers/build_bug.c | |
| parent | d5d1a1a55a7f227c0f41847b0598982f0a93170d (diff) | |
powerpc/rtas: Prevent Spectre v1 gadget construction in sys_rtas()
Smatch warns:
arch/powerpc/kernel/rtas.c:1932 __do_sys_rtas() warn: potential
spectre issue 'args.args' [r] (local cap)
The 'nargs' and 'nret' locals come directly from a user-supplied
buffer and are used as indexes into a small stack-based array and as
inputs to copy_to_user() after they are subject to bounds checks.
Use array_index_nospec() after the bounds checks to clamp these values
for speculative execution.
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Reported-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240530-sys_rtas-nargs-nret-v1-1-129acddd4d89@linux.ibm.com
Diffstat (limited to 'rust/helpers/build_bug.c')
0 files changed, 0 insertions, 0 deletions